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1
19
20
21 package org.apache.cayenne.access.trans;
22
23 import java.util.Collections  ;
24 import java.util.HashMap ;
25 import java.util.Iterator ;
26 import java.util.Map ;
27
28 import org.apache.cayenne.CayenneRuntimeException;
29 import org.apache.cayenne.ObjectId;
30 import org.apache.cayenne.Persistent;
31 import org.apache.cayenne.exp.Expression;
32 import org.apache.cayenne.map.DbAttribute;
33 import org.apache.cayenne.map.DbEntity;
34 import org.apache.cayenne.map.DbJoin;
35 import org.apache.cayenne.map.DbRelationship;
36
37
40 public class DataObjectMatchTranslator {
41 protected Map attributes;
42 protected Map values;
43 protected String operation;
44 protected Expression expression;
45 protected DbRelationship relationship;
46
47 public Expression getExpression() {
48 return expression;
49 }
50
51 public void setExpression(Expression expression) {
52 this.expression = expression;
53 }
54
55 public void reset() {
56 attributes = null;
57 values = null;
58 operation = null;
59 expression = null;
60 relationship = null;
61 }
62
63
67 public void setRelationship(DbRelationship rel) {
68 this.relationship = rel;
69 attributes = new HashMap (rel.getJoins().size() * 2);
70
71 if (rel.isToMany() || !rel.isToPK()) {
72
73 DbEntity ent = (DbEntity) rel.getTargetEntity();
75 Iterator pk = ent.getPrimaryKey().iterator();
76
77 while (pk.hasNext()) {
79 DbAttribute pkAttr = (DbAttribute) pk.next();
80 attributes.put(pkAttr.getName(), pkAttr);
81 }
82 } else {
83
84 Iterator joins = rel.getJoins().iterator();
86 while (joins.hasNext()) {
87 DbJoin join = (DbJoin) joins.next();
88
89 attributes.put(join.getTargetName(), join.getSource());
91 }
92 }
93 }
94
95 public void setDataObject(Persistent obj) {
96 if (obj == null) {
97 values = Collections.EMPTY_MAP;
98 return;
99 }
100
101 setObjectId(obj.getObjectId());
102 }
103
104
107 public void setObjectId(ObjectId id) {
108 if (id == null) {
109 throw new CayenneRuntimeException(
110 "Null ObjectId, probably an attempt to use TRANSIENT object as a query parameter.");
111 }
112 else if (id.isTemporary()) {
113 throw new CayenneRuntimeException(
114 "Temporary id, probably an attempt to use NEW object as a query parameter.");
115 }
116 else {
117 values = id.getIdSnapshot();
118 }
119 }
120
121 public Iterator keys() {
122 if (attributes == null) {
123 throw new IllegalStateException (
124 "An attempt to use uninitialized DataObjectMatchTranslator: "
125 + "[attributes: null, values: "
126 + values
127 + "]");
128 }
129
130 return attributes.keySet().iterator();
131 }
132
133 public DbRelationship getRelationship() {
134 return relationship;
135 }
136
137 public DbAttribute getAttribute(String key) {
138 return (DbAttribute) attributes.get(key);
139 }
140
141 public Object getValue(String key) {
142 return values.get(key);
143 }
144
145 public void setOperation(String operation) {
146 this.operation = operation;
147 }
148
149 public String getOperation() {
150 return operation;
151 }
152 }
153 |
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